I'm not clear on why you specifically would like a sex therapist. It seems like many less specialized therapists (and therefore perhaps more likely to take insurance) could work with you on issues of sexual abuse.

I also still have a lot of anger about a previous terrible therapist even though I have now been with my current (excellent) therapist for 3 years. Bad therapy can really feel like abuse (maybe because it is abuse) and can be just as difficult to overcome. But good therapists are out there and it sounds like you might benefit from having one so take your time and interview carefully. I hope you find someone you can work well with.